Plot of the series: Ji-Sook (Soo-Ae) goes through a difficult period, due to her father's private loan. She begins living as Eun-Ha. Eun-Ha is from a wealthy family and looks like Ji-Sook.
When Min-Woo (Ju Ji-Hoon) was only 7 years old, he became the successor of a large corporation which his family ran. Due to his position, he cannot reveal his feelings. Through his family, he meets Eun-Ha. He notices she is different from other wealthy woman that he has met. Min-Woo has feelings for her.
More information: http://asianwiki.com/Mask_%28Korean_Drama%29
Subtitles (timed for release - direct download): Episode 4 [720p] [Dramafever]
Mirror for subtitles: Episode 4 [720p] [Dramafever]
Instructions for subtitles for anyone that doesn't know: Simply download the subtitles from the link above, extract the subtitles from the zip, and then place it in the same folder as the video file. Make sure the filename is the same for both, this has been done already for you though. Your media player should then be able to play the subs when you load the video file, you can also manually load the subtitles in your media player.